In [1]:
!pip install tensorflow==2.8.0

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In [2]:
!pip install tensorflow-datasets

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In [22]:
%cd /content/p2_image_classifier

/content/intro-to-ml-tensorflow/projects/p2_image_classifier

Your First AI application¶

Going forward, AI algorithms will be incorporated into more and more everyday applications. For example, you might want to include an image classifier in a smart phone app. To do this, you'd use a deep learning model trained on hundreds of thousands of images as part of the overall application architecture. A large part of software development in the future will be using these types of models as common parts of applications.

In this project, you'll train an image classifier to recognize different species of flowers. You can imagine using something like this in a phone app that tells you the name of the flower your camera is looking at. In practice you'd train this classifier, then export it for use in your application. We'll be using this dataset from Oxford of 102 flower categories, you can see a few examples below.

<image.pngimg src='assets/Flowers.png' width=500px>

The project is broken down into multiple steps:

  • Load the image dataset and create a pipeline.
  • Build and Train an image classifier on this dataset.
  • Use your trained model to perform inference on flower images.

We'll lead you through each part which you'll implement in Python.

When you've completed this project, you'll have an application that can be trained on any set of labeled images. Here your network will be learning about flowers and end up as a command line application. But, what you do with your new skills depends on your imagination and effort in building a dataset. For example, imagine an app where you take a picture of a car, it tells you what the make and model is, then looks up information about it. Go build your own dataset and make something new.

Import Resources¶

In [23]:
# TODO: Make all necessary imports.

import tensorflow as tf
import tensorflow_datasets as tfds
import tensorflow_hub as hub
from tensorflow.keras import layers , models ,optimizers

import numpy as np
import matplotlib.pyplot as plt
from PIL import Image
import json
In [24]:
print("TensorFlow version:", tf.__version__)

TensorFlow version: 2.8.0

Load the Dataset¶

Here you'll use tensorflow_datasets to load the Oxford Flowers 102 dataset. This dataset has 3 splits: 'train', 'test', and 'validation'. You'll also need to make sure the training data is normalized and resized to 224x224 pixels as required by the pre-trained networks.

The validation and testing sets are used to measure the model's performance on data it hasn't seen yet, but you'll still need to normalize and resize the images to the appropriate size.

In [25]:
# TODO: Load the dataset with TensorFlow Datasets.
dataset, dataset_info = tfds.load('oxford_flowers102', with_info=True, as_supervised=True)

# TODO: Create a training set, a validation set and a test set.
training, testing, validation  = dataset['train'], dataset['test'], dataset['validation']

Explore the Dataset¶

In [26]:
# TODO: Get the number of examples in each set from the dataset info.
number_of_train_examples = dataset_info.splits['train'].num_examples
number_of_test_examples = dataset_info.splits['test'].num_examples
number_of_validation_examples = dataset_info.splits['validation'].num_examples
# TODO: Get the number of classes in the dataset from the dataset info.
number_of_classes = dataset_info.features['label'].num_classes
In [27]:
# TODO: Print the shape and corresponding label of 3 images in the training set.
# TODO: Print the shape and corresponding label of 3 images in the training set.
for image, label in training.take(3):
  image_np = image.numpy()
  label_np = label.numpy()
  print(f'Image shape: {image_np.shape}, Label: {label_np}')

Image shape: (500, 667, 3), Label: 72
Image shape: (500, 666, 3), Label: 84
Image shape: (670, 500, 3), Label: 70
In [28]:
#TODO: Plot 1 image from the training set. Set the title
# of the plot to the corresponding image label.
image, label = next(iter(training.take(1)))
plt.imshow(image.numpy())
plt.title(f'Image number 1')
plt.show()

Label Mapping¶

You'll also need to load in a mapping from label to category name. You can find this in the file label_map.json. It's a JSON object which you can read in with the json module. This will give you a dictionary mapping the integer coded labels to the actual names of the flowers.

In [29]:
with open('label_map.json', 'r') as f:
    class_names = json.load(f)
In [30]:
# TODO: Plot 1 image from the training set. Set the title
# of the plot to the corresponding class name.
image, label = next(iter(training.take(1)))
class_names = dataset_info.features['label'].names
plt.imshow(image.numpy())
plt.title(f'{class_names[label.numpy()]}')
plt.show()

Create Pipeline¶

In [31]:
 # TODO: Create a pipeline for each set.
def resize_image(image, label):
    image = tf.image.resize(image, (224, 224)) / 255.0
    return image, label

batch_size = 32

train_batches = training.shuffle(number_of_train_examples // 4).map(resize_image).batch(batch_size).prefetch(1)
validation_batches = validation.map(resize_image).batch(batch_size).prefetch(1)
test_batches = testing.map(resize_image).batch(batch_size).prefetch(1)

Build and Train the Classifier¶

Now that the data is ready, it's time to build and train the classifier. You should use the MobileNet pre-trained model from TensorFlow Hub to get the image features. Build and train a new feed-forward classifier using those features.

We're going to leave this part up to you. If you want to talk through it with someone, chat with your fellow students!

Refer to the rubric for guidance on successfully completing this section. Things you'll need to do:

  • Load the MobileNet pre-trained network from TensorFlow Hub.
  • Define a new, untrained feed-forward network as a classifier.
  • Train the classifier.
  • Plot the loss and accuracy values achieved during training for the training and validation set.
  • Save your trained model as a Keras model.

We've left a cell open for you below, but use as many as you need. Our advice is to break the problem up into smaller parts you can run separately. Check that each part is doing what you expect, then move on to the next. You'll likely find that as you work through each part, you'll need to go back and modify your previous code. This is totally normal!

When training make sure you're updating only the weights of the feed-forward network. You should be able to get the validation accuracy above 70% if you build everything right.

Note for Workspace users: One important tip if you're using the workspace to run your code: To avoid having your workspace disconnect during the long-running tasks in this notebook, please read in the earlier page in this lesson called Intro to GPU Workspaces about Keeping Your Session Active. You'll want to include code from the workspace_utils.py module. Also, If your model is over 1 GB when saved as a checkpoint, there might be issues with saving backups in your workspace. If your saved checkpoint is larger than 1 GB (you can open a terminal and check with ls -lh), you should reduce the size of your hidden layers and train again.

In [32]:
 # TODO: Build and train your network.

# Load the MobileNet
feature_extractor_url = "https://tfhub.dev/google/tf2-preview/mobilenet_v2/feature_vector/4"
feature_extractor_layer = hub.KerasLayer(feature_extractor_url, input_shape=(224, 224, 3), trainable=False)

# Define a new, untrained feed-forward network as a classifier
model = models.Sequential([
    feature_extractor_layer,
    layers.Dense(512, activation='relu'),
    layers.Dropout(0.2),
    layers.Dense(number_of_classes, activation='softmax')
])

# Compile the model
model.compile(optimizer=optimizers.Adam(),
              loss='sparse_categorical_crossentropy',
              metrics=['accuracy'])

# Define the early stopping callback
early_stopping = tf.keras.callbacks.EarlyStopping(monitor='val_loss', patience=3, restore_best_weights=True)

# Train the classifier with the early stopping callback
history = model.fit(train_batches,
                    epochs=15,
                    validation_data=validation_batches,
                    callbacks=[early_stopping])

Epoch 1/15
32/32 [==============================] - 100s 3s/step - loss: 4.0899 - accuracy: 0.1559 - val_loss: 2.7802 - val_accuracy: 0.5078
Epoch 2/15
32/32 [==============================] - 80s 2s/step - loss: 1.7182 - accuracy: 0.6412 - val_loss: 1.6198 - val_accuracy: 0.6324
Epoch 3/15
32/32 [==============================] - 81s 3s/step - loss: 0.7618 - accuracy: 0.8206 - val_loss: 1.2157 - val_accuracy: 0.7020
Epoch 4/15
32/32 [==============================] - 89s 3s/step - loss: 0.4257 - accuracy: 0.9127 - val_loss: 1.0039 - val_accuracy: 0.7490
Epoch 5/15
32/32 [==============================] - 82s 3s/step - loss: 0.2417 - accuracy: 0.9608 - val_loss: 0.8929 - val_accuracy: 0.7706
Epoch 6/15
32/32 [==============================] - 81s 3s/step - loss: 0.1409 - accuracy: 0.9892 - val_loss: 0.8255 - val_accuracy: 0.7843
Epoch 7/15
32/32 [==============================] - 81s 3s/step - loss: 0.0901 - accuracy: 0.9931 - val_loss: 0.7899 - val_accuracy: 0.7833
Epoch 8/15
32/32 [==============================] - 88s 3s/step - loss: 0.0567 - accuracy: 0.9961 - val_loss: 0.7315 - val_accuracy: 0.8010
Epoch 9/15
32/32 [==============================] - 80s 3s/step - loss: 0.0448 - accuracy: 1.0000 - val_loss: 0.7294 - val_accuracy: 0.8039
Epoch 10/15
32/32 [==============================] - 88s 3s/step - loss: 0.0397 - accuracy: 0.9980 - val_loss: 0.7151 - val_accuracy: 0.8098
Epoch 11/15
32/32 [==============================] - 82s 3s/step - loss: 0.0272 - accuracy: 1.0000 - val_loss: 0.7075 - val_accuracy: 0.8098
Epoch 12/15
32/32 [==============================] - 81s 3s/step - loss: 0.0243 - accuracy: 1.0000 - val_loss: 0.6970 - val_accuracy: 0.8127
Epoch 13/15
32/32 [==============================] - 91s 3s/step - loss: 0.0229 - accuracy: 1.0000 - val_loss: 0.7155 - val_accuracy: 0.8059
Epoch 14/15
32/32 [==============================] - 87s 3s/step - loss: 0.0186 - accuracy: 1.0000 - val_loss: 0.6884 - val_accuracy: 0.8118
Epoch 15/15
32/32 [==============================] - 79s 2s/step - loss: 0.0146 - accuracy: 1.0000 - val_loss: 0.6916 - val_accuracy: 0.8118
In [33]:
# TODO: Plot the loss and accuracy values achieved during training for the training and validation set.

# Plot the loss and accuracy values
plt.figure(figsize=(12, 4))

plt.subplot(1, 2, 1)
plt.plot(history.history['loss'], label='Training Loss')
plt.plot(history.history['val_loss'], label='Validation Loss')
plt.legend()
plt.title('Loss')

plt.subplot(1, 2, 2)
plt.plot(history.history['accuracy'], label='Training Accuracy')
plt.plot(history.history['val_accuracy'], label='Validation Accuracy')
plt.legend()
plt.title('Accuracy')

plt.show()

# Save the trained model as a Keras model
model.save('flower_classifier_model.h5')

Testing your Network¶

It's good practice to test your trained network on test data, images the network has never seen either in training or validation. This will give you a good estimate for the model's performance on completely new images. You should be able to reach around 70% accuracy on the test set if the model has been trained well.

In [34]:
# TODO: Print the loss and accuracy values achieved on the entire test set.
test_loss, test_accuracy = model.evaluate(test_batches)
print(f'Test Loss: {test_loss}')
print(f'Test Accuracy: {test_accuracy}')

193/193 [==============================] - 249s 1s/step - loss: 0.8409 - accuracy: 0.7808
Test Loss: 0.8408918380737305
Test Accuracy: 0.7807773351669312

Save the Model¶

Now that your network is trained, save the model so you can load it later for making inference. In the cell below save your model as a Keras model (i.e. save it as an HDF5 file).

In [35]:
# TODO: Save your trained model as a Keras model.

h5_model = f'./HDF5.h5'
model.save(h5_model)

Load the Keras Model¶

Load the Keras model you saved above.

In [36]:
# TODO: Load the Keras model
loaded_model = tf.keras.models.load_model(h5_model,custom_objects={'KerasLayer': hub.KerasLayer})

loaded_model.summary()

Model: "sequential_2"
_________________________________________________________________
 Layer (type)                Output Shape              Param #   
=================================================================
 keras_layer_2 (KerasLayer)  (None, 1280)              2257984   
                                                                 
 dense_4 (Dense)             (None, 512)               655872    
                                                                 
 dropout_2 (Dropout)         (None, 512)               0         
                                                                 
 dense_5 (Dense)             (None, 102)               52326     
                                                                 
=================================================================
Total params: 2,966,182
Trainable params: 708,198
Non-trainable params: 2,257,984
_________________________________________________________________

Inference for Classification¶

Now you'll write a function that uses your trained network for inference. Write a function called predict that takes an image, a model, and then returns the top $K$ most likely class labels along with the probabilities. The function call should look like:

probs, classes = predict(image_path, model, top_k)

If top_k=5 the output of the predict function should be something like this:

probs, classes = predict(image_path, model, 5)
print(probs)
print(classes)
> [ 0.01558163  0.01541934  0.01452626  0.01443549  0.01407339]
> ['70', '3', '45', '62', '55']

Your predict function should use PIL to load the image from the given image_path. You can use the Image.open function to load the images. The Image.open() function returns an Image object. You can convert this Image object to a NumPy array by using the np.asarray() function.

The predict function will also need to handle pre-processing the input image such that it can be used by your model. We recommend you write a separate function called process_image that performs the pre-processing. You can then call the process_image function from the predict function.

Image Pre-processing¶

The process_image function should take in an image (in the form of a NumPy array) and return an image in the form of a NumPy array with shape (224, 224, 3).

First, you should convert your image into a TensorFlow Tensor and then resize it to the appropriate size using tf.image.resize.

Second, the pixel values of the input images are typically encoded as integers in the range 0-255, but the model expects the pixel values to be floats in the range 0-1. Therefore, you'll also need to normalize the pixel values.

Finally, convert your image back to a NumPy array using the .numpy() method.

In [37]:
# TODO: Create the process_image function

# process the image
def process_image(image_input):
    if isinstance(image_input, np.ndarray):
        image = image_input
    else:
        image = Image.open(image_input)
        image = np.asarray(image)

    image = tf.convert_to_tensor(image)
    image = tf.image.resize(image, (224, 224))
    image = image / 255.0
    return image.numpy()

To check your process_image function we have provided 4 images in the ./test_images/ folder:

  • cautleya_spicata.jpg
  • hard-leaved_pocket_orchid.jpg
  • orange_dahlia.jpg
  • wild_pansy.jpg

The code below loads one of the above images using PIL and plots the original image alongside the image produced by your process_image function. If your process_image function works, the plotted image should be the correct size.

In [38]:
from PIL import Image

image_path = './test_images/hard-leaved_pocket_orchid.jpg'
im = Image.open(image_path)
test_image = np.asarray(im)

processed_test_image = process_image(test_image)

fig, (ax1, ax2) = plt.subplots(figsize=(10,10), ncols=2)
ax1.imshow(test_image)
ax1.set_title('Original Image')
ax2.imshow(processed_test_image)
ax2.set_title('Processed Image')
plt.tight_layout()
plt.show()

Once you can get images in the correct format, it's time to write the predict function for making inference with your model.

Inference¶

Remember, the predict function should take an image, a model, and then returns the top $K$ most likely class labels along with the probabilities. The function call should look like:

probs, classes = predict(image_path, model, top_k)

If top_k=5 the output of the predict function should be something like this:

probs, classes = predict(image_path, model, 5)
print(probs)
print(classes)
> [ 0.01558163  0.01541934  0.01452626  0.01443549  0.01407339]
> ['70', '3', '45', '62', '55']

Your predict function should use PIL to load the image from the given image_path. You can use the Image.open function to load the images. The Image.open() function returns an Image object. You can convert this Image object to a NumPy array by using the np.asarray() function.

Note: The image returned by the process_image function is a NumPy array with shape (224, 224, 3) but the model expects the input images to be of shape (1, 224, 224, 3). This extra dimension represents the batch size. We suggest you use the np.expand_dims() function to add the extra dimension.

In [39]:
# TODO: Create the predict function

def predict(path, model, top_k):
    with Image.open(path) as img:
        img = np.asarray(img)
    processed_image = process_image(img)
    image_batch = np.expand_dims(processed_image, axis=0)
    prediction = model.predict(image_batch)
    probabilities, classes = tf.nn.top_k(prediction, k=top_k)
    probs_list = list(probabilities.numpy()[0])
    classes_list = list(classes.numpy()[0])
    return probs_list, classes_list, processed_image

Sanity Check¶

It's always good to check the predictions made by your model to make sure they are correct. To check your predictions we have provided 4 images in the ./test_images/ folder:

  • cautleya_spicata.jpg
  • hard-leaved_pocket_orchid.jpg
  • orange_dahlia.jpg
  • wild_pansy.jpg

In the cell below use matplotlib to plot the input image alongside the probabilities for the top 5 classes predicted by your model. Plot the probabilities as a bar graph. The plot should look like this:

image.png

You can convert from the class integer labels to actual flower names using class_names.

In [40]:
# TODO: Plot the input image along with the top 5 classes
import glob

with open('label_map.json', 'r') as f:
    class_names = json.load(f)

def plot_image_with_probabilities(image_path, model, class_names, top_k):
    probabilities, classes, processed_image = predict(image_path, model, top_k)

    # Convert class indices to class labels
    class_labels = [class_names[str(cls)] for cls in classes]

    # Plot the image and class probabilities
    plt.figure(figsize=(10, 10))

    # Plot image
    plt.subplot(1, 2, 1)
    plt.imshow(processed_image)
    plt.axis('off')
    plt.title('Input Image')

    # Plot class probabilities
    plt.subplot(1, 2, 2)
    plt.barh(range(top_k), probabilities)
    plt.yticks(range(top_k), class_labels)
    plt.title('Top 5 Class Probabilities')
    plt.xlabel('Probability')
    plt.xlim(0, 1.1)

    plt.tight_layout()
    plt.show()
image_paths = glob.glob('./test_images/*.jpg')
for image_path in image_paths:
    plot_image_with_probabilities(image_path, loaded_model, class_names,5)
In [41]:
#Todo predict.py
"""
if __name__ == '__main__':
    main()
"""
Out[41]:
"\nif __name__ == '__main__':\n    main()\n"
In [43]:
!python predict.py ./test_images/orange_dahlia.jpg flower_classifier_model.h5 --top_k 3 --category_names label_map.json

2024-09-07 13:25:41.556719: W tensorflow/stream_executor/platform/default/dso_loader.cc:64] Could not load dynamic library 'libcudart.so.11.0'; dlerror: libcudart.so.11.0: cannot open shared object file: No such file or directory; LD_LIBRARY_PATH: /usr/local/lib/python3.10/dist-packages/cv2/../../lib64:/usr/local/nvidia/lib:/usr/local/nvidia/lib64
2024-09-07 13:25:46.825425: W tensorflow/stream_executor/platform/default/dso_loader.cc:64] Could not load dynamic library 'libcuda.so.1'; dlerror: libcuda.so.1: cannot open shared object file: No such file or directory; LD_LIBRARY_PATH: /usr/local/lib/python3.10/dist-packages/cv2/../../lib64:/usr/local/nvidia/lib:/usr/local/nvidia/lib64
2024-09-07 13:25:46.825523: W tensorflow/stream_executor/cuda/cuda_driver.cc:269] failed call to cuInit: UNKNOWN ERROR (303)

Predicted Classes and Probabilities:
========================================
 1. Class: english marigold     | Probability: 0.4973
 2. Class: orange dahlia        | Probability: 0.3974
 3. Class: blanket flower       | Probability: 0.0431
========================================
In [44]:
!zip -r ../p2_image_classifier.zip ./

  adding: Project_Image_Classifier_Project.ipynb (deflated 28%)
  adding: assets/ (stored 0%)
  adding: assets/Flowers.png (deflated 0%)
  adding: assets/inference_example.png (deflated 4%)
  adding: .ipynb_checkpoints/ (stored 0%)
  adding: .ipynb_checkpoints/Project_Image_Classifier_Project-checkpoint.ipynb (deflated 72%)
  adding: HDF5.h5 (deflated 8%)
  adding: result.txt (deflated 60%)
  adding: README.md (deflated 51%)
  adding: flower_classifier_model.h5 (deflated 8%)
  adding: test_images/ (stored 0%)
  adding: test_images/wild_pansy.jpg (deflated 1%)
  adding: test_images/hard-leaved_pocket_orchid.jpg (deflated 1%)
  adding: test_images/orange_dahlia.jpg (deflated 1%)
  adding: test_images/cautleya_spicata.jpg (deflated 1%)
  adding: label_map.json (deflated 54%)
  adding: predict.py (deflated 60%)
In [1]:
#@title Convert ipynb to HTML in Colab
# Upload ipynb
from google.colab import files
f = files.upload()

# Convert ipynb to html
import subprocess
file0 = list(f.keys())[0]
_ = subprocess.run(["pip", "install", "nbconvert"])
_ = subprocess.run(["jupyter", "nbconvert", file0, "--to", "html"])

# download the html
files.download(file0[:-5]+"html")
Upload widget is only available when the cell has been executed in the current browser session. Please rerun this cell to enable. 
Saving Copy_of_Empty_Project_Image_Classifier_Project (1).ipynb to Copy_of_Empty_Project_Image_Classifier_Project (1).ipynb